Undercharged and Overcharged Symptoms

[oscar-uk]

Hello all, i have just recenlty got a job as a trainee refrigeration engineer in Manchester, England. I just wanted to know, what the symptoms are for a Undercharged and a Overcharged System.. ??

[Hussain09]

Hey Oscar, when a refrigeration system is overcharged, the compressor does tend to make loud (louder than normal) squelching noise..

Hope this hepls

[Grizzly]

Hi Oscar.

Here goes!
Overcharged…
1) Excessive subcooling at condenser outlet.
2) Tripped on High Pressure Cut-out.
3) High suction pressure with Low Suction Superheat.
4) High delivery gauge reading with Normal superheat readings
5) Low Delivery Gauge reading with low superheat
6) Power absorbed by Compressor High

Undercharged…
1) Cut-out on L.P.
2) Low Suction Pressure with High Suction superheat
3) Low Discharge Pressure with High superheat
4) Power absorbed by Compressor Low
5) Comp shut down on L.P.

The above is a guideline and not an complete list!
Good Luck Grizzly

[Gary]

Insufficient airflow through either coil will alter the refrigerant side symptoms, making troubleshooting extremely difficult. Always check for airflow problems first.

[Grizzly]

Insufficient airflow through either coil will alter the refrigerant side symptoms, making troubleshooting extremely difficult. Always check for airflow problems first.

Good Point Gary, I have had many iced up comps and lp problems from frozen Cold store evaporator,
Even when the fan has tripped because the melting ice on one of it's blades during defrost.
Has bonded it to it's cowl tripping the fan motor overload!
Grizzly

[nike123]

http://www.refrigeration-engineer.com/forums/showpost.php?p=134551&postcount=1